George Gershwin. At 25, his jazz- influenced “Rhapsody in Blue” premiered in New York. His best known works include “An American in Paris”, “Cuban Overture” and “Lullaby for Strings", as well as “Porgy and Bess”, which included "Summertime". Unfortunately, at the young age of 38, he died of a brain tumor. Who knows what other beautiful music he would have created….